migrate cc-utils actions/workflows from @master to @v1

[ccwienk]

Switch references to cc-utils
actions and reusable workflows from @master to @v1.

Motivation

v1 is the intended stable branch for downstream users. All internal cross-references
are pinned by commit digest, ensuring a consistent, self-contained snapshot. Coverage
(e.g. pre-qualification) will increase over time.

master remains the development branch and continues to work, but is not intended for
downstream consumption.

See the Reuse and Branching Model for details.

[hyperspace-insights]

Summary

The following content is AI-generated and provides a summary of the pull request:

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How to categorize this PR?
/kind task
/area logging

What this PR does / why we need it:
This PR migrates all references to cc-utils GitHub Actions and reusable workflows from the @master branch tag to the @v1 stable branch tag. The v1 branch is the intended stable target for downstream consumers, while master remains the development branch and is not intended for downstream use.

Code changes:

• .github/workflows/build.yaml: Updated references to prepare.yaml, oci-ocm.yaml, trusted-checkout, and export-ocm-fragments actions/workflows from @master to @v1.
• .github/workflows/non-release.yaml: Updated reference to post-build.yaml workflow from @master to @v1.
• .github/workflows/pr-release-notes-validation.yaml: Updated reference to validate-release-notes.yaml workflow from @master to @v1.
• .github/workflows/release.yaml: Updated reference to release.yaml workflow from @master to @v1.

Additional context:
The v1 branch provides a consistent, self-contained snapshot with all internal cross-references pinned by commit digest. Coverage and pre-qualification will increase over time. See the Reuse and Branching Model for details.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Release note:

NONE

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PR Bot Information

Version: 1.20.0 | 📖 Documentation | 🚨 Create Incident | 💬 Feedback

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[nickytd]

/lgtm

[gardener-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nickytd

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• OWNERS [nickytd]

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[gardener-prow]

LGTM label has been added.

Details

Git tree hash: b2763672eb39584690388f905202cd6c2c9733c2